Abstract: In order to effectively improve the structural damage and environmental pollution caused by bamboo and wood raft cultivation equipment in Beibu Gulf of Guangxi in the process of long-term use, and improve its ability to withstand wind and waves, the HDPE raft culture equipment was selected as the research object, taking the common 15 m long and 12 m wide single raft in Beibu Gulf of Guangxi as an example. AQWA software was used to establish a hydrodynamic analysis model, and based on frequency domain analysis and time domain analysis methods, mooring length and mooring Angle were taken as response indexes to carry out research on the hydrodynamic characteristics and motion response of raft farming equipment, and obtain the motion response and mooring tension variation rules of various degrees of freedom of raft farming equipment. The results show: Under the condition of level 7th high wind and waves, the motion response and mooring cable tension of raft culture equipment change significantly under different mooring lengths and angles. When the ratio of mooring cable length to water depth l/d =1.08 and the Angle of mooring cable is less than 30°, the motion response and mooring cable tension of raft culture equipment are smaller. The optimum mooring form is determined under this condition. Conclusion: Through theoretical and numerical simulation analysis, parameter comparison and early warning are provided for the structural state and safety of aquaculture equipment under different sea conditions, and theoretical reference is also provided for the better application of HDPE materials to raft aquaculture equipment.

Key words: oyster, raft culture, HDPE, hydrodynamic analysis

摘要： 为有效改善广西北部湾海域竹木材质牡蛎筏式养殖装备在长期使用过程中出现的结构损坏与环境污染现象，提高其抗风浪能力，以广西北部湾海域常见长15 m、宽12 m单筏为例，选用HDPE材质筏式养殖装备作为研究对象，采用AQWA软件建立水动力分析模型，并基于频域分析和时域分析方法，以系泊长度与系泊角度作为响应指标，开展筏式养殖装备水动力特性及运动响应研究，获取筏式养殖装备各自由度运动响应和系泊张力变化规律。结果显示：在7级疾风海况迎浪条件下，不同系泊长度与系泊角度下，筏式养殖装备运动响应与系泊缆绳张力均发生显著变化，在系泊缆绳长度与水深之比l/d =1.08和系泊缆绳夹角小于30°时筏式养殖装备运动响应与系泊缆绳张力较小，确定该条件下为最优系泊形式。结论：通过理论和数值仿真分析，为筏式养殖装备面对不同海况下结构状态与安全性提供参数对比和预警，同时也为HDPE材料更好地应用到筏式养殖装备提供理论参考。

关键词: 牡蛎, 筏式养殖, HDPE, 水动力分析